Electronics for CEDAR Cristina Lazzeroni, Marian Krivda, Richard Staley, Xen Serghi, Karim Massri University of Birmingham, UK 3/5/2012 1

R.Staley, CEDAR UK Meeting - Liverpool - 3rd May CEDAR PMT Socket Production 1 PMT socket uses 2 PCB discs. Made as a panel of 8 ‘discs’: Populate Both sides Dynode bias resistors + coupling capacitors Pop-out & Assemble

R.Staley, CEDAR UK Meeting - Liverpool - 3rd May CEDAR PMT Socket Production As of Mid-day 1 st May panels populated on 1 side. (Simon Pyatt) PMT socket tested before handing over to Liverpool University Ohmmeter to check resistor bias network Multimeter to check capacitors High voltage power check

R.Staley, CEDAR UK Meeting - Liverpool - 3rd May CEDAR PMT Socket Timescales For 128 Sockets Assembled at Birmingham Mar.April 2012MayJuneJuly Aug Design - Done x Order Components x Layout at Birmingham x PCB Production x Design/Layout Checks with PMT PCB Assembly - UK Production Testing PMT Signal Cables - Find + Make ? Engineer (rjs) effort at 50% Technician effort at 50% Physicist / Student External PCB company 32 PMT Sockets 128 PMT Sockets + 5% Spares Holding item – Still to find a suitable cable ( thin, high-speed, differential, screened, LSZH ) CERN Stores ( ) no longer stocked RS, Farnell, …

All the patch panel (PP) schematics are finished The HV PMT PP layout is 95% finished. Will be completed next week and will then be sent to be manufactured by PCB-Pool and be ready for the end of May. The rest of the PP will follow and will be ready for June We are waiting for a high voltage connector from CERN for the HV PSU PP to see if it is suitable for our needs. There are two options for the HV cabling from the HV PMT PP to the Environmental Enclosure (EE) HV PSU PP.  Option 1: have loose HV cables from the HV PMT PP grouped together in groups of 32 and then fed to the PP in the EE.  Option 2: have another PP mounted on the detector, per HV PMT PP, so the HV cables are short, neat and tidy. Then connect a cable from this PP to the HV PSU PP on the EE. X.Serghi, CEDAR UK Meeting - Liverpool - 3rd May 2012

Option 1: Option 2: X.Serghi, CEDAR UK Meeting - Liverpool - 3rd May 2012

Needs mounting holes Tidy up PCB-Pool next week. ~8 day turn around for 4 PP A couple of days to populate board X.Serghi, CEDAR UK Meeting - Liverpool - 3rd May 2012

NINO board proposal ver. D (design which allows separation of NINO inputs and outputs) M. Krivda, CEDAR UK Meeting - Liverpool - 3rd May Max. 215 mm x 155 mm PCB 32 NINO Outputs to HPTDC 8 differential inputs from PMTs Edge facing incoming beam when folded down ELMB128-A 50mm x 67 mm DCS connectors (CAN bus daisy chain) DC power input IC 1 IC 2 IC 3 IC 4 IC 5 IC 6 IC 7 IC 8 SK 2 SK 1

NINO PCB M. Krivda, CEDAR UK Meeting - Liverpool - 3rd May

NINO board M. Krivda, CEDAR UK Meeting - Liverpool - 3rd May options for setting NINO Threshold Only one external power supply 7V is necessary => on-board regulators for analog 2.5V & 5V 3 separate GNDs: CAN bus, Digital, Analog The layer structure is: Top Tracks AGND Plane Inner tracks 1 Inner tracks 2 2v5 & 5v plane Bottom Tracks Ground guard rail around the NINO inputs

NINO board analog ground and cooling Voltage reg. LHC4913PDU needs cooling AGND must be isolated from other noisy grounds ! M. Krivda, CEDAR UK Meeting - Liverpool - 3rd May PowerSO-20 slug-up AGND (Possibility to isolate/detach heatsink from detector ground ???) The fixing hole connected to AGND through 0 ohm resistor

NINO board Schematic entry and specification of components -> done PCB design at RAL -> done Verification of design -> done Production -> RAL waiting for offer from 3 companies (2 options – 10 or 20 days) If delivery for RadTol version of components is too long => use standard ones and replace them later M. Krivda, CEDAR UK Meeting - Liverpool - 3rd May

NINO board timescale 10 or 20 working days for production, assembly (RAL organizes with external company) 3-4 days delivery to CERN 4 weeks for testing M. Krivda, CEDAR UK Meeting - Liverpool - 3rd May

Karim Massri – CEDAR UK meeting – Liverpool 3/05/ NINO test - Experimental setup NINO TRIGGER Passiv e splitter Florence preAmp/Differential Output Patch panel NINO→TD C ADC sampler TDC

Karim Massri – CEDAR UK meeting – Liverpool 3/05/ Getting the charge from the ADC ADC signals with amplitude > 1mV have been fitted with a Gaussian

Karim Massri – CEDAR UK meeting – Liverpool 3/05/ Checking the NINO threshold Value obtained from NINO checkpoint using Crispin's convertion factor (4 mV = 1 fC) ~5% losses due to a previous signal too close (<15 ns) [not relevant for our test]

Karim Massri – CEDAR UK meeting – Liverpool 3/05/ Results – Florence preAmp Minimum Affordable Threshold (MAT): 391 mV = pC Single Electron Response LOSS (Filled area): ~ 2.5% Pedestal →fit with exponential Signal →fit with a polya MA T

Karim Massri – CEDAR UK meeting – Liverpool 3/05/ Results – Differential Output Minimum Affordable Threshold (MAT): 180 mV = pC Single Electron Response LOSS (Filled area): ~ 0.06% Pedestal →fit with exponential Signal →fit with a polya MA T Pedestal measured by ADC seems to be greater than the NINO (cfr. MAT) → TO BE INVESTIGATED